Apple emailed users to inform them of iWork.com updates. You can see the email here:
The storage bit is great, but too little too late. The Keynote playback though looks like a great way to quickly get a Keynote file to playback on your iPad for presentations. Better than iTunes syncing for sure.
[Updated: 1/10/11 at 8:48 AM]
MacStories has some lovely screenshots.